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Using Charles Law To Determine Absolute Zero Tuesday 7th of December Introduction One of the variables that affects the volume of a gas is the temperature of the gas and its surroundings This volume-temperature relationship is quantified in Charless law The law states that as the temperature of a gas decreases the volume of the gas decreases proportionately An ideal gas at 273 K for example would decrease in volume by 1273 of its original volume for each Celsius degree the temperature decreases If the temperature decreased sufficiently the volume should decrease to zero Real gases however liquefy and solidify long before this theoretical limit called absolute zero is reached By using air as a sample of a real gas and limiting the temperature range it is possible to estimate the temperature that would correspond to absolute zero Materials Used Apron Goggles Thermometer Hot Plate Paper Towel Thin Stem Pipet 2 400-mL Beakers Objectives Demonstrate the relationships between the temperature of a gas and its volume Graph the relationship Estimate the temperature of absolute zero by extrapolation Procedure Fill two 400-mL beakers half full with tap water Begin heating the water in one beaker to a temperature that is 10C above room temperature Fill a thin stem pipet completely with room temperature water To make sure the pipet is filled first draw in as much water as possible Then holding the pipet by the bulb with the stem pointing upward squeeze the bulb slightly to eject any air left in the bulb and stem Keeping this pressure on the bulb insert the tip of the stem into the water Release the pressure on the bulb

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